4. 57 year old with history of MI and PCI 12 years ago. RF: hypertension and hyperlipidemia. Now presenting with exertional chest pain worsened by cold weather and stress. Medications bisoprolol 10mg OD, Simvastatin 40 mg OD, aspirin 75mg OD. Examination was unremarkable. MPS arranged (shown) . What is the abnormality seen ?